21226561465652 has 6 divisors (see below), whose sum is σ = 37146482564898. Its totient is φ = 10613280732824.

The previous prime is 21226561465601. The next prime is 21226561465721. The reversal of 21226561465652 is 25656416562212.

It can be written as a sum of positive squares in only one way, i.e., 16368222526756 + 4858338938896 = 4045766^2 + 2204164^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21226561465594 and 21226561465603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2653320183203 + ... + 2653320183210.

It is an arithmetic number, because the mean of its divisors is an integer number (6191080427483).

Almost surely, 2^{21226561465652} is an apocalyptic number.

It is an amenable number.

21226561465652 is a deficient number, since it is larger than the sum of its proper divisors (15919921099246).

21226561465652 is a wasteful number, since it uses less digits than its factorization.

21226561465652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5306640366417 (or 5306640366415 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 53.

The spelling of 21226561465652 in words is "twenty-one trillion, two hundred twenty-six billion, five hundred sixty-one million, four hundred sixty-five thousand, six hundred fifty-two".